EP1427157A1 - Procédé de detection d'une rafale à partir d'une estimation de canal et système recepteur pour la mise en oeuvre du procédé - Google Patents
Procédé de detection d'une rafale à partir d'une estimation de canal et système recepteur pour la mise en oeuvre du procédé Download PDFInfo
- Publication number
- EP1427157A1 EP1427157A1 EP03292885A EP03292885A EP1427157A1 EP 1427157 A1 EP1427157 A1 EP 1427157A1 EP 03292885 A EP03292885 A EP 03292885A EP 03292885 A EP03292885 A EP 03292885A EP 1427157 A1 EP1427157 A1 EP 1427157A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- burst
- channel
- receiver system
- detection
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 10
- 230000011664 signaling Effects 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 6
- 230000006978 adaptation Effects 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
- H04L7/0012—Synchronisation information channels, e.g. clock distribution lines by comparing receiver clock with transmitter clock
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
Definitions
- the present invention relates to the detection, by a receiver, of signal bursts transmitted over a radio channel in a system of communication.
- bursts can be of different types, such as initial sync bursts or bursts of random access to the mobile network. This last case will be more particularly developed thereafter, without this being limiting.
- a mobile terminal of a communication network When a mobile terminal of a communication network wishes have communication resources, for example to carry out a call, it executes a request to the network that manages and distributes the resources.
- This random access request generally consists of the transmission of a message whose preamble is a burst of signal representing a predetermined digital sequence.
- This message is sent on a radio channel amount listened to by a network receiving system.
- this channel is called RACH or PRACH (" Packet Random Access CHannel ").
- RACH Packet Random Access CHannel
- the format of such a message is described in particular in 5.2.2.2 of the technical specification TS 25.211 version 5.2.0 Release 5, "Physical channels and mapping of transport channels onto physical channels (FDD) ", published in September 2002 by the 3GPP organization.
- Reliable detection of random access bursts on the RACH is important because the failure rate of establishing communications seen from a mobile radio user depends directly on it.
- An improvement of the detection reliability is particularly interesting for reception systems that include antennas sector or omnidirectional smart antennas.
- the predetermined digital sequence transmitted on the RACH channel by a mobile terminal has a size of 4096 "chips", a chip being a piece of code according to the encoding used in the system.
- the exchanged data are in frames of 10 ms, themselves subdivided into 15 slots (or "slots") of 666 ⁇ s, corresponding to 2560 chips.
- the signal burst associated with the digital sequence transmitted on the RACH is received within an interval corresponding to two slots consecutive.
- a criterion must be defined to decide, from such a correlation, whether the predetermined numerical sequence is present. This one is usually based on the energy level of the correlation, which is compared to a level predefined threshold.
- threshold is tricky: a low threshold causes many false detections that disrupt the system, while too high a threshold misses access requests from terminals relatively far from the base station.
- a power ramp can be used by the mobile terminal to retransmit the burst of network access on the RACH channel regularly with, for each new transmission, transmission power increased, as long as the network has not responded to its request for resources.
- This method improves the detection of the burst by the radio network, especially in the case where the low transmission power of the first transmissions is at the origin of the absence of detection of the gust on the RACH.
- An object of the present invention is to propose a method of predefined signal detection which alleviates the disadvantages of known methods.
- the invention thus proposes a method for detecting a burst of signal transmitted on the initiative of a transmitter on a radio channel listened to by a receiving system, the transmitted burst representing a digital sequence predetermined, in which channel parameters representing a statistical behavior of the radio channel and one evaluates a magnitude of detection from the estimated channel parameters and a correlation between a signal received at the receiving system and the predetermined digital sequence.
- the detection quantity is compared with a detection threshold adaptive to decide if the signal burst is detected.
- the reliability of the detection is thus increased thanks to a account a posteriori of the effects of this detection.
- Feedback then allows a relevant adaptation of the detection threshold used.
- the invention also proposes a receiver system adapted to the setting of the above method.
- the mobile terminal 1 transmits a burst of signal on a channel of the type RACH when it wishes to access the network and obtain from the network communication resources.
- the network consists mainly of a core network ensuring the switching of data and connection to other networks of communication, such as the PSTN ("Public Switched Telephone Network”), and a radio network responsible for data exchange and signaling with mobile terminals.
- PSTN Public Switched Telephone Network
- radio network responsible for data exchange and signaling with mobile terminals.
- the radio network generally includes transmission systems and receivers, belonging to base stations, as well as controllers of base stations providing higher level functions than the simple transmission of data, such as the management of radio resources or mobility for example. Some functions can be performed indifferently by the base stations or by the controllers of stations of based. Some can also be done in a shared way by these entities.
- a base station including a reception system 2 able to receive signals transmitted in particular by the terminal 1.
- This controller 3 is called BSC ("Base Station Controller") in the terminology used in the GSM system.
- BSC Base Station Controller
- RNC Radio Network Controller
- the reception system 2 illustrated in FIG. 1 comprises two main reception channels, in phase (I) and in quadrature (Q).
- the received radio signal is mixed with two radio waves in quadrature at the carrier frequency.
- the signal Z comprises both the signals possibly transmitted by the mobile terminal 1 and the residual signals consisting of noise and interference. Since the carrier frequencies are generally shared by several users, the signals transmitted by other mobile terminals are noise-like interferences in a CDMA system such as UMTS. At each instant, the system 2 thus receives signals Z x , Z y consisting of digital sequences on each of the two I and Q channels.
- the complex signal z z x + jz produced there by these filters 3 and shows a correlation between the received signal and the sequence to be detected, the calculated frequency chips.
- the two real signals z x and z y respectively correspond to the real and imaginary components of the signal detected after matched filtering.
- H1 be the hypothesis according to which the burst of random access has been sent on the RACH channel and H0 the complementary hypothesis according to which only noise is present.
- the ratio of probabilities based on knowledge of the detected signal z can be written as follows, according to the Bayes formula: where P (a / b) denotes the probability of a knowing b.
- the receiver system 2 considers that the burst has been issued on the RACH if this ratio P (H1 / z) / P (H0 / z) is greater than a certain threshold c.
- the ratio P (H1) / P (H0) P (H1) / 1-P (H1) is independent of the detected signal.
- the receiver system 2 therefore evaluates the probability ratio P (z / H1) / P (z / H0) for deciding, by comparison with a threshold, the detection or not a burst of random access on the RACH channel.
- This assessment takes advantageously account the propagation conditions on this channel.
- the probability of detecting the signal z after adapted filtering knowing that the predefined sequence has been transmitted on the RACH can then be written: with C the set of possible realizations of the complex gain a on the propagation channel, N 0 the power of the noise and p (a) the probability density of the gain a.
- a calculation module 5 of the receiver system 2 estimates the moments ma x, n and ma y, n at the output of the adapted filters 3 for each of the two reception channels respectively.
- This evaluation is performed on a time interval said interval which corresponds to a number of chips lower than the number of possible positions of the burst of random access within two consecutive slots. If we take the case of UMTS, where there are 1024 positions possible of the burst inside 2 consecutive slots, one can choose by example an evaluation interval corresponding to 32 chips.
- the evaluation of the moments then consists in estimating the probability p x (a x ), p y (a y ) of finding each value of a characteristic component of the gain of the propagation channel a x, n and a y, n , in the corresponding sample of the signal detected in the evaluation interval. These probabilities are then weighted by the nth power of the associated component value, before being summed, as indicated by the formulas and respectively.
- the module 5 for calculating the moments sends the result of its calculation to a module 6 for detecting the RACH of the receiver system 2.
- This module calculates the ratio of probabilities P (z / H1) / P (z / H0 ) by the formula (4), truncating the summation to an order k ⁇ :
- the noise variance N 0 is conventionally available in the receiver, from an average of the energy of the complex signal. at the output of the adapted filters 3.
- the number k is greater than 2, to take into account moments of high order that finely translate the channel behavior.
- the detection module 6 can memorize tables giving, for certain standard values, the corresponding value for the Hermite polynomials. This makes it easy to determine the value of the ratio P (z / H1) / P (z / H0) for any new detected value of z x and z y within the moment evaluation interval.
- the probability ratio thus estimated is then compared by the module of detection 6 at a detection threshold c ', for example set according to a target of reliability of detection of RACH. If the ratio P (z / H1) / P (z / H0) is greater than c '(which corresponds to the fact that the ratio P (H1 / z) / P (H0 / z) exceeds itself a certain threshold as seen above), the receiver system 2 then considers that the predefined sequence has been sent on the RACH channel. Resources will be able to be made available to the terminal applicant.
- receiving system 2 may decide to conclude that no sequence has was issued on the RACH channel.
- the terminal which does not receive the expected response, can apply a repetition method to improve the reliability of detection by the system receiver 2, for example by implementing a power ramp.
- the ratio P (H1) / P (H0) is evaluated, updated over time.
- step 11 begins by determining an observation period T obs , during which certain indicators will be estimated. This period must be long enough to obtain a significant estimate of the indicators, while allowing a sufficiently regular update of the estimates. For example, T obs can be set to 30 minutes.
- the number A of bursts detected on the RACH channel during T obs can be easily known by the receiver system since it is it that decides whether or not to detect such bursts. It is therefore sufficient for him to count each detection during the observation period.
- This report, updated in step 14 for each observation period T obs , can advantageously be introduced into the detection criterion (1), in order to make reliable the detection of network access requests on a RACH channel, thanks to a posteriori taking into account the behavior of the users soliciting the RACH channel.
- the threshold c 'used is set proportionally to (TA) / A.
- Another aspect of the invention includes an estimate of the rate of false detections of the burst during the observation period T obs .
- the receiving system has the maximum possible number T of random access bursts that can be transmitted on the RACH during an observation period T obs . It furthermore determines a number of erroneous detections of such a burst on the RACH channel, that is to say a number F of signals detected and wrongly interpreted by the receiver system as corresponding to requests for access to the network. .
- a request for access to the network by a terminal 1 is indeed the subject a signaling exchange determined. It should therefore be verified that this whether or not the exchange went right to the end, whether the resource request detected at the receiving system was real.
- FIG. 3 shows such a signaling exchange as part of the GSM radio system.
- the access request to the network by the terminal 10 is the subject of the message amount "Channel_Request" on a RACH channel, incorporating the burst to be detected by the base station.
- the base station 20 informs the BSC 30 of the request ("Channel_Required” message).
- the BSC 30 reserves then communication resources that he indicates to the base station 20 ("Channel_Activate” message), before receiving an acknowledgment in response (“Channel_Activate_Ack” message).
- the BSC 30 then sends a "Immediate_Assignment” message to terminal 10 via the base station 20 to tell him the communication resources that him are affected.
- a Layer 3 signaling exchange is performed to confirm the opening of a communication channel between the terminal 10 and the radio network ("SABME", "UA” and "Estab_Indic” messages).
- the receiving system can conclude the access request to the network of the terminal 10 has been wrongly detected. In However, if the signaling exchange confirms that the terminal 10 has issued an access request, the receiving system will not count a detection wrong.
- the receiver system that is to say the base station 20 and / or the BSC 30, counts the "false” requests during T obs , and deduces therefrom the number F of erroneous detections on the RACH channel (or “Number”). False RACH “in Figure 2) over the observation period T obs (step 15 in Figure 2).
- step 16 it obtains the estimate of the rate of false detections on the RACH channel (or "false RACH rate” in FIG. 2) defined as the F / T ratio of the number F of false RACHs by the maximum number T possible from RACH over the observation period T obs .
- the receiver system uses the F / T ratio to adjust the signal detection criteria on the RACH channel it uses.
- the detection threshold level c or c ' may advantageously be modified as a function of this F / T ratio. For example, if F / T is too high (in comparison with an objective that can for example be of the order of 10 -3 ), it means that the detection of the burst is too sensitive and therefore that the detection threshold must be hardened (increased). Conversely, if the F / T ratio is considered too low by the receiving system, this means that the detection tends to miss bursts of random access, and that the detection criterion must be relaxed, that is, to reduce the threshold.
- the criterion thus adjusted according to the ratio of probabilities P (H1) / P (H0) and / or the false detection rate F / T is applied by the base station (step 18 in Figure 2) to ratings of the magnitude of detection (for example of the form P (z / H1) / P (z / H0)) obtained in step 17.
- the base station 20 and the BSC were considered 30 as a whole forming a receiver system. In reality, some receiver system functions will be implemented by the base station 20 and others by the BSC 30.
- burst detection is usually performed by base station 20, while some of the estimates from steps 12 to 16 may be performed by BSC 30.
- BSC 30 may indicate to the base station 20 how to adapt the detection criterion that it uses. he can for example tell him that the detection threshold it uses must be increased or decreased by a certain value, for example by a number no increase or decrease that it determines.
- the RNC may send such orders to Node B via the NBAP signaling exchange protocol ("Node B Application Part").
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
- la figure 1 est un schéma d'un système mettant en oeuvre l'invention;
- la figure 2 est un diagramme schématisant les principaux échanges de signalisation en vue d'une allocation de ressources à un terminal mobile dans un système de type GSM; et
- la figure 3 est un organigramme schématisant certaines étapes du procédé selon l'invention.
- objectif d'un certain taux de fausses détections de la rafale, lequel taux peut varier avec l'environnement radio si on garde la même valeur de seuil;
- le rapport de probabilités P(H1) / P(H0) = P(H1) / 1-P(H1) intervenant dans l'expression (1) ci-dessus.
Claims (22)
- Procédé de détection d'une rafale de signal transmise à l'initiative d'un émetteur (1) sur un canal radio écouté par un système récepteur (2), la rafale transmise représentant une séquence numérique prédéterminée, dans lequel on estime des paramètres de canal représentant un comportement statistique du canal radio et on évalue une grandeur de détection à partir des paramètres de canal estimés et d'une corrélation entre un signal reçu au système récepteur et la séquence numérique prédéterminée, caractérisé en ce qu'on compare la grandeur de détection à un seuil de détection adaptatif pour décider si la rafale de signal est détectée.
- Procédé selon la revendication 1, dans lequel on estime, sur une période d'observation, un taux de fausses détections de la rafale, et on fait varier le seuil de détection adaptatif en fonction du taux de fausses détections estimé.
- Procédé selon la revendication 2, dans lequel l'estimation du taux de fausses détections de la rafale comporte un décompte d'un nombre de procédures de signalisation qui commencent par la détection d'une rafale pendant la période d'observation et qui n'aboutissent pas.
- Procédé selon l'une quelconque des revendications précédentes, dans lequel on estime, sur une période d'observation, un rapport d'une probabilité de transmission de la rafale par un émetteur par une probabilité d'absence de transmission de la rafale.
- Procédé selon la revendication 4, dans lequel l'estimation du rapport de probabilités, comporte un décompte du nombre de détections de la rafale pendant la période d'observation.
- Procédé selon l'une quelconque des revendications précédentes, dans lequel lesdits paramètres de canal estimés comprennent des moments d'ordre supérieur à 2 du gain sur le canal radio.
- Procédé selon la revendication 6, dans lequel lesdits paramètres de canal estimés comprennent des moments d'ordre 0 à k du gain sur le canal radio, où k est un entier plus grand que 2.
- Procédé selon la revendication 6 ou 7, dans lequel le signal reçu est soumis à un filtrage adapté à la séquence numérique prédéterminée pour obtenir ladite corrélation sous forme d'un signal complexe ayant une première composante sur une voie en phase (zx) et une seconde composante sur une voie en quadrature (zy).
- Procédé selon la revendication 8, dans lequel la grandeur de détection évaluée est proportionnelle à où N0 désigne la puissance estimée du bruit sur le canal radio, zx et zy désignent lesdites première et seconde composantes, max,n et may,n désignent les moments d'ordre n du gain respectivement sur la voie en phase et sur la voie en quadrature, Hn désigne le polynôme de Hermite d'ordre n et k est un entier plus grand que 2.
- Procédé selon l'une quelconque des revendications précédentes, dans lequel ledit émetteur (1) est un terminal mobile, ledit système récepteur (2) appartient à un réseau de radiocommunication et dans lequel ladite rafale est émise pour requérir l'accès au réseau.
- Système récepteur apte à détecter une rafale de signal transmise à l'initiative d'un émetteur (1) sur un canal radio écouté par le système récepteur (2), la rafale transmise représentant une séquence numérique prédéterminée, comprenant des moyens d'estimation de paramètres de canal représentant un comportement statistique du canal radio, des moyens d'évaluation d'une grandeur de détection à partir des paramètres de canal estimés et d'une corrélation entre un signal reçu au système récepteur et la séquence numérique prédéterminée, des moyens de comparaison de la grandeur de détection à un seuil de détection pour décider si la rafale de signal est détectée, et des moyens d'adaptation du seuil de détection.
- Système récepteur selon la revendication 11, comprenant en outre des moyens d'estimation, sur une période d'observation, d'un taux de fausses détections de la rafale, dans lequel les moyens d'adaptation comprennent des moyens pour faire varier le seuil de détection en fonction du taux de fausses détections estimé.
- Système récepteur selon la revendication 12, dans lequel les moyens d'estimation du taux de fausses détections comportent des moyens de décompte d'un nombre de procédures de signalisation qui commencent par la détection d'une rafale pendant la période d'observation et qui n'aboutissent pas.
- Système récepteur selon l'une quelconque des revendications 11 à 13, comprenant en outre des moyens d'estimation, sur une période d'observation, d'un rapport d'une probabilité de transmission de la rafale par un émetteur par une probabilité d'absence de transmission de la rafale.
- Système récepteur selon la revendication 14, dans lequel les moyens d'estimation du rapport de probabilités, comportent des moyens de décompte du nombre de détections de la rafale pendant la période d'observation.
- Système récepteur selon l'une quelconque des revendications 11 à 15, comprenant au moins une station de base (20) et un contrôleur de station de base (30), dans lequel les moyens d'estimation de paramètres de canal, les moyens d'évaluation de la grandeur de détection et les moyens de comparaison font partie de la station de base, tandis qu'une partie au moins des moyens d'adaptation fait partie du contrôleur de station de base.
- Système récepteur selon la revendication 16, dans lequel le contrôleur de station de base (30) comprend des moyens de transmission à la station de base (20) de messages de réglage du seuil de détection.
- Système récepteur selon l'une quelconque des revendications 11 à 17, dans lequel lesdits paramètres de canal estimés comprennent des moments d'ordre supérieur à 2 du gain sur le canal radio.
- Système récepteur selon la revendication 18, dans lequel lesdits paramètres de canal estimés comprennent des moments d'ordre 0 à k du gain sur le canal radio, où k est un entier plus grand que 2.
- Système récepteur selon la revendication 18 ou 19, comprenant des moyens de filtrage, adapté à la séquence numérique prédéterminée, auquel est soumis le signal reçu pour obtenir ladite corrélation sous forme d'un signal complexe ayant une première composante sur une voie en phase (zx) et une seconde composante sur une voie en quadrature (zy).
- Système récepteur selon la revendication 20, dans lequel la grandeur de détection évaluée est proportionnelle à où N0 désigne la puissance estimée du bruit sur le canal radio, zx et zy désignent lesdites première et seconde composantes, max,n et may,n désignent les moments d'ordre n du gain respectivement sur la voie en phase et sur la voie en quadrature, Hn désigne le polynôme de Hermite d'ordre n et k est un entier plus grand que 2.
- Système récepteur selon l'une quelconque des revendications 11 à 21, dans lequel ledit émetteur (1) est un terminal mobile, ledit système récepteur (2) appartient à un réseau de radiocommunication et dans lequel ladite rafale est émise pour requérir l'accès au réseau.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0215272 | 2002-12-04 | ||
FR0215272A FR2848360B1 (fr) | 2002-12-04 | 2002-12-04 | Procede de detection d'un signal et systeme recepteur pour la mise en oeuvre du procede |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1427157A1 true EP1427157A1 (fr) | 2004-06-09 |
EP1427157B1 EP1427157B1 (fr) | 2006-02-08 |
Family
ID=32309991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03292885A Expired - Fee Related EP1427157B1 (fr) | 2002-12-04 | 2003-11-20 | Procédé de detection d'une rafale à partir d'une estimation de canal et système recepteur pour la mise en oeuvre du procédé |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040247053A1 (fr) |
EP (1) | EP1427157B1 (fr) |
DE (1) | DE60303493D1 (fr) |
FR (1) | FR2848360B1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102150469A (zh) * | 2008-09-11 | 2011-08-10 | 艾利森电话股份有限公司 | 通信网络系统中的方法和装置 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8077974B2 (en) | 2006-07-28 | 2011-12-13 | Hewlett-Packard Development Company, L.P. | Compact stylus-based input technique for indic scripts |
US8717907B2 (en) * | 2008-02-21 | 2014-05-06 | Telefonaktiebolaget L M Ericsson (Publ) | Adjustment of radio detection level for request signals based observed false detection |
CN101969662B (zh) * | 2009-07-27 | 2015-04-01 | 中兴通讯股份有限公司 | 一种随机接入优化的终端测量上报的方法及系统 |
CN102256280B (zh) * | 2011-08-24 | 2015-04-29 | 华为技术有限公司 | 随机接入方法和设备 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0923207A2 (fr) * | 1997-12-09 | 1999-06-16 | Nec Corporation | Circuit de synchronisation de réception, récepteur utilisant un tel circuit et système de communication numérique |
US6144709A (en) * | 1995-12-29 | 2000-11-07 | Nokia Telecommunications Oy | Method of detecting a call set-up burst, and a receiver |
US6487187B1 (en) * | 1997-11-26 | 2002-11-26 | Airnet Communications Corporation | Random access control channel gain control and time slot recovery for remote in-band translator in time division multiple access wireless system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5479251A (en) * | 1993-12-30 | 1995-12-26 | Corning Incorporated | Methods for determining optical properties of optical waveguide fibers using an optical time domain reflectometer |
SE503522C2 (sv) * | 1994-10-31 | 1996-07-01 | Ericsson Telefon Ab L M | Förfarande och anordning för kanalestimering |
US5745484A (en) * | 1995-06-05 | 1998-04-28 | Omnipoint Corporation | Efficient communication system using time division multiplexing and timing adjustment control |
DE60028179T2 (de) * | 2000-03-14 | 2007-03-15 | Lucent Technologies Inc. | Vefahren und Mobilfunknetz zum Minimieren der RACH-Sendeleistung |
US20020057730A1 (en) * | 2000-08-04 | 2002-05-16 | Jonas Karlsson | Spreading factor detector |
US7180881B2 (en) * | 2001-09-28 | 2007-02-20 | Interdigital Technology Corporation | Burst detector |
-
2002
- 2002-12-04 FR FR0215272A patent/FR2848360B1/fr not_active Expired - Fee Related
-
2003
- 2003-11-20 DE DE60303493T patent/DE60303493D1/de not_active Expired - Lifetime
- 2003-11-20 EP EP03292885A patent/EP1427157B1/fr not_active Expired - Fee Related
- 2003-11-21 US US10/719,776 patent/US20040247053A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6144709A (en) * | 1995-12-29 | 2000-11-07 | Nokia Telecommunications Oy | Method of detecting a call set-up burst, and a receiver |
US6487187B1 (en) * | 1997-11-26 | 2002-11-26 | Airnet Communications Corporation | Random access control channel gain control and time slot recovery for remote in-band translator in time division multiple access wireless system |
EP0923207A2 (fr) * | 1997-12-09 | 1999-06-16 | Nec Corporation | Circuit de synchronisation de réception, récepteur utilisant un tel circuit et système de communication numérique |
Non-Patent Citations (1)
Title |
---|
IN-KYUNG KIM ET AL: "Comparisons of CFAR burst detection schemes for TDMA systems employing constant modulus modulation format", MILITARY COMMUNICATIONS CONFERENCE, 1998. MILCOM 98. PROCEEDINGS., IEEE BOSTON, MA, USA 18-21 OCT. 1998, NEW YORK, NY, USA,IEEE, US, 18 October 1998 (1998-10-18), pages 360 - 364, XP010307792, ISBN: 0-7803-4506-1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102150469A (zh) * | 2008-09-11 | 2011-08-10 | 艾利森电话股份有限公司 | 通信网络系统中的方法和装置 |
US8805362B2 (en) | 2008-09-11 | 2014-08-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and arrangement for satisfying performance requirements by tuning parameters for accessing a network with random access channels |
CN102150469B (zh) * | 2008-09-11 | 2014-10-29 | 艾利森电话股份有限公司 | 通信网络系统中的方法和装置 |
Also Published As
Publication number | Publication date |
---|---|
FR2848360B1 (fr) | 2005-08-26 |
DE60303493D1 (de) | 2006-04-20 |
EP1427157B1 (fr) | 2006-02-08 |
FR2848360A1 (fr) | 2004-06-11 |
US20040247053A1 (en) | 2004-12-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0486362B1 (fr) | Procédé de transmission de données entre mobiles ou véhicules autonomes | |
FR2732490A1 (fr) | Procede de reception multicapteur d'une station de base d'un reseau de communication echangeant des donnees avec des mobiles, et dispositif pour sa mise en oeuvre | |
FR2750000A1 (fr) | Commande de la puissance de transmission dans le transfert sans fil de donnees par paquets | |
FR2858162A1 (fr) | Procede d'acces a des ressources d'un systeme de radiocommunication, terminal mobile et station de base pour la mise en oeuvre du procede | |
EP1172961A1 (fr) | Système de communication, récepteur, méthode d'estimation d'erreurs dues au canal | |
EP1427157B1 (fr) | Procédé de detection d'une rafale à partir d'une estimation de canal et système recepteur pour la mise en oeuvre du procédé | |
EP1303071B1 (fr) | Procédé et dispositif de sélection automatique du débit dans des transmissions haute fréquence | |
EP1427156B1 (fr) | Procédé de détection de rafales de signal et système récepteur pour la mise en oeuvre du procédé | |
EP3646505B1 (fr) | Procédé de transmission de données et de retransmission harq | |
FR2782429A1 (fr) | Procede de changement du niveau de codage de donnees numeriques transmises entre un emetteur et un recepteur a un debit constant | |
EP1112630B1 (fr) | Procede d'estimation du rapport signal a bruit dans un recepteur de telecommunications et application de ce procede au controle d'un emetteur | |
EP1453217B1 (fr) | Procédé d'atténuation de l'influence d'interférences produites par des systèmes de transmission radio en rafales sur des communications UWB | |
WO2020161419A1 (fr) | Procédé d'émission à deux protocoles, procédé de réception et dispositifs et signal correspondants | |
EP1206045A1 (fr) | Procédé de correction de l'erreur de frequence | |
EP1805905B1 (fr) | Procede de synchronisation d'un recepteur radio, et recepteur adapte pour mettre en uvre un tel procede | |
FR3141028A1 (fr) | Procédé de retransmission coopérative dans un système OMAMRC avec allocation de ressources et sélections des sources à aider conjointes | |
EP2462715B1 (fr) | Procédé de recherche d'une entité à l'aide d'un dispositif vérificateur et dispositifs associés | |
FR3104373A1 (fr) | Procédé et dispositif mettant en œuvre ce procédé pour accéder à un canal partagé pour répondre à une requête de demande de relais | |
EP2517523B1 (fr) | Procédé et dispositif de régulation d'émission dans un réseau de télécommunication sans fil | |
WO2010076481A1 (fr) | Procede d'emission de donnees par une entite d'un reseau sans fil et entite | |
WO2009047418A1 (fr) | Procede de communication de donnees dans un reseau cellulaire cooperatif, dispositif, et produit programme d'ordinateur correspondants | |
WO2010076480A1 (fr) | Procede de prevention de collision entre stations pour reseau sans fil | |
EP1981244A1 (fr) | Procédé pour établir une session depuis un dispositif sur un premier réseau via un deuxième dispositif et système électroniques correspondants | |
FR2792793A1 (fr) | Procede et dispositif de transmission de donnees par signaux sonores | |
WO2013014381A1 (fr) | Procede et dispositif de generation d'un signal porteur d'un code numerique |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK |
|
17P | Request for examination filed |
Effective date: 20040525 |
|
17Q | First examination report despatched |
Effective date: 20040916 |
|
AKX | Designation fees paid |
Designated state(s): DE FR GB |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE FR GB |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REF | Corresponds to: |
Ref document number: 60303493 Country of ref document: DE Date of ref document: 20060420 Kind code of ref document: P |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060509 |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20060420 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20061109 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E Free format text: REGISTERED BETWEEN 20091112 AND 20091118 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP Owner name: ALCATEL LUCENT, FR Effective date: 20130613 Ref country code: FR Ref legal event code: CD Owner name: ALCATEL LUCENT, FR Effective date: 20130613 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: GC Effective date: 20130920 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 13 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 14 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20180530 Year of fee payment: 15 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20180530 Year of fee payment: 15 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20181120 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20181130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20181120 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E Free format text: REGISTERED BETWEEN 20200820 AND 20200826 |